Further problems extending Python (cerr undefined)

[Pearu Peterson]

On 13 Dec 2002, JB wrote:

> I receive the following error message, when I am trying to 
> load my extension module:
> 
> bz at linux:~/python-programs/python-konstruktion> python 
> extest.py
> Traceback (most recent call last):
>   File "extest.py", line 1, in ?
>     import pythongeo
> ImportError: ./pythongeo.so: undefined symbol: cerr

You need to link your extension module with std++ library.
Acctually, you should use g++ (instead of gcc) for linking C++ extension
modules.

To replace gcc with g++ in a setup.py file, I used to use the following
codelet in setup.py files:

#+++HACK: replace linker gcc with g++ +++++++++++

from distutils import sysconfig
save_init_posix = sysconfig._init_posix
def my_init_posix():
    save_init_posix()
    g = sysconfig._config_vars
    if g['LDSHARED'][:3]=='gcc':
        print 'my_init_posix: changing LDSHARED =',`g['LDSHARED']`,
        g['LDSHARED'] = 'g++'+g['LDSHARED'][3:]
        print 'to',`g['LDSHARED']`
sysconfig._init_posix = my_init_posix

#+++++++++++++++++++++++++++++++++++++++++++++++++

Pearu